题目

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。                              In a national spelling contest in America, an 11-year-old girl was asked to spell a certain word. But with her soft voice the judges were not sure if she spelled the word with the letter A or E.  71   By now, the girl knew she had misspelled the word. But instead of lying and telling the judges she had said the correct letter, she told the truth that she had said the wrong letter.  72       As the girl已知复数Z=iCn1+i2Cn2+…+inCnn（其中i为虚数单位），以下判断中正确的为（　　）A．不存在n∈N*，使Z为纯虚数B．对任意的n∈N*，Z为实数C．存在无限个n∈N*，使Z为实数D．不存在n∈N*，使Z为实数